RE: partitioned Views - Union All

From: Elliott, Patrick <patrick.elliott_at_medtronic.com>
Date: Thu, 23 Aug 2007 14:16:17 -0500
Message-ID: <302F06193D7F4D48ABC997408E786BD00258D7D9@MSPM1BMSGM09.ent.core.medtronic.com>

Partitioned views are the way to go if you have a check constraint in place for each union all, and IF the optimizer works as it is supposed to. When I worked with them, I could never get the pruning to work as it was supposed too. YMMV

Pat

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From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Suresh Chaganti Sent: Thursday, August 23, 2007 12:55 PM To: oracle-l_at_freelists.org
Subject: partitioned Views - Union All

Hello

I may have to move some historical data to a different database, while retaining flexbillity to query on demand.

Partitioned Views seem to be perfect option with UNION ALL views where the optimizer is smart about not going to remote DB if it doesnt need to.

But I am concerned about Rule Set for Union All view which practically defeats the whole purpose.

More confusing is Oracle's statement to use partitioned Tables starting from Oracle 8 instead of Partition views. In the scenario I described above, obviously partitioned view is the way to go.

Here is the link for any one interested http://download-west.oracle.com/docs/cd/A58617_01/server.804/a58246/dist rib.htm#8451

Has any one implemented this feature. Please respond with any tips, hidden parameters

thanks
Suresh

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Received on Thu Aug 23 2007 - 14:16:17 CDT